| 摘要 |
PURPOSE:To measure the temperature of a heating resistor at a high speed with high precision by calculating variation in the temperature of the heating resistor from the detected value of variation in voltage or current appearing at the heating resistor by impressed electric power and the detected value of variation based upon only variation in impressed electric power. CONSTITUTION:The series circuit of the heating resistor Rh and a detection resistance Rs is impressed with a voltage E from a power source 1 to develope a voltage Vh across Rh and a voltage V across Rs. The series circuit of Ra and Rb connected in parallel to said series circuit generates a reference voltage equal to the voltages Vh and V when a resistance value is Ro at reference temperature To, and a small sresistance-temperature coefficient among Rs, Ra, and Rb is used. Then, Rs detects variation of the current flowing through Rh, i.e. variation due to variation in voltage E and temperature variation in the resistance value of Rh with the voltage V, and Rb detects the detected value corresponding only variation in voltage E with the voltage Vo on the basis of the detected value of Rs at the temperature to of Rh. The voltages V and Vo are processed by a divider to measure the temperature of the heating body at a high speed with high precision. |
